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EP0266859A1 - Procédé et dispositif pour la production de particules congelées microfines - Google Patents

Procédé et dispositif pour la production de particules congelées microfines Download PDF

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Publication number
EP0266859A1
EP0266859A1 EP87304480A EP87304480A EP0266859A1 EP 0266859 A1 EP0266859 A1 EP 0266859A1 EP 87304480 A EP87304480 A EP 87304480A EP 87304480 A EP87304480 A EP 87304480A EP 0266859 A1 EP0266859 A1 EP 0266859A1
Authority
EP
European Patent Office
Prior art keywords
gas
vessel
cold vapour
frozen
refrigerant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP87304480A
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German (de)
English (en)
Inventor
Takeki Hata
Masuo Tada
Hiroyuki Oura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taiyo Sanso Co Ltd
Original Assignee
Taiyo Sanso Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP23869586A external-priority patent/JPH0781763B2/ja
Priority claimed from JP61244878A external-priority patent/JP2524714B2/ja
Application filed by Taiyo Sanso Co Ltd filed Critical Taiyo Sanso Co Ltd
Publication of EP0266859A1 publication Critical patent/EP0266859A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C1/00—Producing ice

Definitions

  • This invention relates to a method and apparatus for the production of microfine frozen particles, such as fine ice particles, useful as abrasive in surface treatment involving blasting, cleaning, or the like.
  • a known method to produce microfine frozen particles comprises atomizing the material to be frozen, such as water, into an insulated vessel for freezing it.
  • the vessel contains a refrigerant, such as liquid nitrogen, so that the atomized particles of the material freeze by heat exchange with the refrigerant as they sink into the refrigent.
  • a refrigerant such as liquid nitrogen
  • JP-A-58-17392 it is known from JP-A-58-17392 to have a method wherein the freezing of the liquid particles takes place not in a refrigerant but in the cold gas phase of vaporized refrigerant.
  • a vessel has a nozzle for atomizing the material to be frozen located at an upper position.
  • a pair of tubes for spouting a refrigerant inwardly are placed on the interior wall of the vessel near and below this nozzle.
  • One tube is higher than the other and a scraper is placed at the bottom of the vessel.
  • liquid material to be frozen such as water
  • a refrigerant such as liquid nitrogen
  • the atomized material to be frozen comes into contact with the spouted refrigerant and its vaporized gas, some in flows that cross each other, some in parallel flows, and others in opposing flows.
  • the frozen particles pile up at the bottom of the vessel and are collected from the vessel by means of a scraper.
  • the vessel must be designed so that the particles of material to be frozen, immediately after the atomisation, pass through the region within reach of the spouted liquid refrigerant so as to accelerate the vaporisation of the spouted refrigerant by heat exchange with the particles from the atomisation.
  • An object of the present invention is to provide an apparatus as well as a method for the production of microfine frozen particles by means of which frozen particles useful as an abrasive for blasting, cleaning, etc., can be produced in uniform particle sizes, in the optimal globular shapes for said application, and with good reliability.
  • Another object of the present invention is to provide an apparatus as well as a method for the production of microfine frozen particles by means of which the frozen particles can be produced and collected easily and satisfactorily, without involving problems with respect to lowering of the hardness of the frozen particles and agglomeration between frozen particles.
  • Still another object of the present invention is to provide an apparatus as well as a method for the production of microfine frozen particles whereby the energy consumption rate to produce the frozen particles can be produced without losing efficiency, so that through this energy saving the production cost can be reduced considerably.
  • an apparatus for the production of microfine frozen particles comprising:- a vessel for the production of frozen particles having a cold vapour outlet towards the upper end of the vessel; screen means for collecting frozen particles and being located in the vessel to divide the inside thereof into an upper cold vapour region and a lower cold vapour source region; means for producing a cold vapour component for supply to said cold vapour source region; and an atomiser positioned close to the cold vapour outlet for producing in the cold vapour region atomised particles of a liquid material to be frozen; wherein said cold vapour component rises through said screen means towards said cold vapour outlet and contacts said atomised particles in the cold vapour region in such a manner to undergo heat exchange therewith so that the atomised particles become frozen before they descend to said screen means.
  • the cold vapour component is supplied to the cold vapour source region, passes through the screen means into the cold vapour region, and rises through the latter-mentioned region toward the cold vapour outlet.
  • the cold vapour component undergoes heat exchange with the atomised particles of the material to be frozen and thereby assumes different densities at parts so that gradually it rises toward the cold vapour outlet.
  • the particles into which the material to be frozen has been atomised gradually undergo heat exchange through contact with the rising cold vapour component in opposing flows as they fall naturally through the cold vapour region and thus they become frozen.
  • the atomized particles become frozen where the cold vapour component is in a vaporised state only, they can assume globular shapes by surface tension for freezing without interference. As there is only a gradually rising flow of the cold vapour component each frozen particle is separate from another and produced with substantially a uniform particle size.
  • the frozen particles thus formed fall onto a screen means and are collected therefrom with a means for collecting frozen particles. Since the cold vapour component is vaporized and passes through the screen means in a rising flow, the frozen particles caught on the screen are kept cold and made free from degradation in hardness and agglomeration with other particles at the time of collecting, all by virtue of the flowing cold vapour componet.
  • reduction in energy consumption rate for the production of frozen particles can be achieved by including a refrigerating system wherein a cooling gas, such as air, or a gas of nitrogen or argon, is cooled with a mechanical refrigerator and cooled gas as the cold vapour component is supplied to the cold vapour source region for producing frozen particles in such a manner as to fill the freezing vessel with the cold vapour component necessary for the freezing process.
  • a cooling gas such as air, or a gas of nitrogen or argon
  • a mechanical refrigerator cooled gas as the cold vapour component is supplied to the cold vapour source region for producing frozen particles in such a manner as to fill the freezing vessel with the cold vapour component necessary for the freezing process.
  • a refrigerant such as liquid nitrogen. This is introduced into the vessel in a jet of mist so as to fill the vessel with a mixture of a cooled gas and a vaporised refrigerant as the cold vapour component.
  • a cooled gas-supplying pipe connects a source of cooling gas to the cold vapour source region and a mechanical refrigerator is provided for cooling the cooling gas in said cooled gas-supplying pipe.
  • a mechanical refrigerator is provided for cooling the cooling gas in said cooled gas-supplying pipe.
  • a spouting device can be attached to the cooled gas-supplying pipe so that a refrigerant mixed with the cooled gas is thereby spouted into the cold vapour source region under the force of the cooled gas.
  • a refrigerating system wherein a refrigerant is used in conjunction with a cooling gas permits the refrigerator to have a lower capacity than where a cooling gas alone is used for the refrigeration. Where are is used as the cooling gas, it is advisable, as a preliminary step before the refrigeration, to pressurise the cooling air by a compressor and eliminate the moisture and preferably also the carbon dioxide gas therefrom. This is because of the possibilities that, as the cooling air becomes colder, moisture turns into ice and carbon dioxide into dry ice with the result that, for example, the cooled gas-supplying pipe is eventually blocked.
  • a dehumidifier based on an adsorbent such as synthetic zeolite or a reversing heat exchanger serves the purpose.
  • an apparatus based on an adsorbent such as synthetic zeolite is applicable. Since carbon dioxide freezes into dry ice under partial pressure at a temperature in the range -140°C - -150°C, it is not really necessary to eliminate carbon dioxide where the temperature of the cooled gas is higher than that at which dry ice is formed.
  • the screen comprises a net structure or the like inclined downwardly and the apparatus includes a frozen particle collecting pipe connected with said screen at its lowest part.
  • the apparatus can include means for causing said screen to vibrate or shake.
  • a portion of the screen means can be moved out of the vessel. This can be a chieved by making the screen means in the form of a rotating disc or a conveyor belt.
  • a method for the production of microfine frozen particles comprising the steps of:- providing a cold vapour component within a vessel so as to fill the inside of said vessel with cold vapour; introducing atomised material to be frozen into the vessel in such a manner as to make the atomised particles thereof frozen by heat exchange with said cold vapour; removing said frozen particles from the vessel by collection means provided for the vessel.
  • the method includes the further step wherein said cold vapour component is produced by ejection of a gas of nitrogen, argon or dried air into liquid nitrogen contained in said vessel.
  • the cold vapour component can be produced by the step of a cooling gas of air, nitrogen, argon or the like being cooled by mechanical refrigeration and then supplied to the inside of the vessel so as to fill the vessel with the cooled gas.
  • a refrigerant such as liquid nitrogen can be injected in the form of mist into said vessel in such a manner as to fill the vessel with a mixed gas of said cooled gas and vaporised refrigerant as said cold vapour component.
  • the method includes the step wherein said cooling gas comprises dehumidified dry air, or dehumidified dry air and where carbon dioxide gas is removed therefrom.
  • the method includes the step of filtering the cooling before it is supplied to the inside of said vessel.
  • an apparatus for producing microfine frozen particles comprises a freezing vessel 1, a means for collecting frozen particles 2, an atomiser 3, and a means for vaporising refrigerant 4.
  • the vessel 1 comprises a heat insulated closed vessel whose horizontal cutaway section is a square with each side measuring 400 mm with a cold gas exhaust outlet 1a on the side at the top.
  • the means for collecting frozen particles identified generally by numeral 2 comprises a screen 5, whose sides narrow toward the lower end to form an inverted pyramidal shape as shown, with a frozen particle collecting pipe 6 erected in the centre at the bottom.
  • the screen 5 is fixed to the freezing vessel 1 at positions on the interior side thereof and divides the interior space into an upper region which constitutes the region of cold vapour 7a and a lower region which constitutes the region of refrigerant vapour generation 7b.
  • the screen 5 is of a material which is resistant to cold such as a metal net screen with a mesh through whic h only refrigerant gas is permitted through (for example, 150 mesh Japan Industrial Standard Type SUS304).
  • the lower end of the pipe 6 is led out of the freezing vessel 1 through the bottom and is connected with a frozen particle-collecting valve 6a, such as a rotary valve.
  • a frozen particle-collecting valve 6a such as a rotary valve.
  • the angle theta which the screen 5 forms with a horizontal plane can be selected according to the quantity of the refrigerant gas, size of the frozen particles, etc. as variable factors and depending on whether a scraper is used or not. When a scraper is not used, the standard degree of this angle is about 45°.
  • the atomiser 3 comprises an atomiser proper 8 which is attached to the central top side of the freezing vessel 1 and is connected with a material feeding pipe 9 for feeding a liquid material to be frozen, such as water, and also with an atomising gas conduit 10 for drawing in an adequately pressurized and cooled atomising gas such as nitrogen gas.
  • a liquid material to be frozen such as water
  • an atomising gas conduit 10 for drawing in an adequately pressurized and cooled atomising gas such as nitrogen gas.
  • the water is atomised downwardly through the nozzle 8a at the tip of the atomiser 8 under the pressure of the atomising gas.
  • the size of the droplets (atomised particles) 14a can be adjusted by controlling the nozzle hole diameter and atomising pressure.
  • the material to be atomised, besides water, can comprise various other liquids provided that the material suits heat exchange with refrigerant vapour for freezing.
  • the means for vaporising refrigerant generally identified by numeral 4 is supplied with a refrigerant 12, such as liquid nitrogen, through a refrigerant-supplying pipe 11, so that a quantity of refrigerant 12 is held in the vessel defined by the region of refrigerant gas generation 7b.
  • the refrigerant 12 is made to vaporise into a gas or cold vapour component 12a by injection of a bubbling gas, such as dried air, or a gas of nitrogen or argon, into the refrigerant through a bubbling tube 13.
  • a vaporized refrigerant or cold gas component 12a rises from the region or source of refrigeration gas generation 7b, passes through the screen 5 and through the region of cold vapour 7a toward the cold gas outlet 1a.
  • the gas component 12a undergoes heat exchange bit by bit with the atomised material to be frozen 14a (i.e. droplets as a mist) and thereby assumes different densities as it rises toward the cold gas exhaust outlet 1a.
  • the liquid droplets 14a after atomisation, fall naturally through the region of cold vapour 7a and freezes by gradual heat exchange as it contacts the rising cold vapour component 12a in opposing flow.
  • frozen particles 14b are collected without piling up on the screen 5.
  • the inventors of the present application have discovered that when water is atomised from the nozzle 8a at the rate of 0.2 l/min (12 l/h), the average temperature of the cold gas phase at a lower position in the region 7a, that is, at a position close to the screen 5 in the region of cold gas phase, ranges to below -80°C. Also, when the diameter of the atomised water droplet 14a is 300 microns or less and water is atomised with a pressure of 4 kg/cm2 or less, a reduction to close to 1 m or so of the height H between the nozzle 8a and the screen 5 which represents the effective height of the cold gas phase 7a, still enables the production of ice particles 14b of good quality.
  • the temperature of the cold vapour region has a close correlation with the generation of the refrigerant gas or cold vapour component 12a.
  • the temperature distribution at a plane across the region of cold vapour 7a is shown for each of the three different values of the generation of the gas of liquid nitrogen 12, i.e., 20 Nm3/h, 40 Nm3/h and 60 Nm3/h, against atomisation of water at 0.2 l/min. From this diagram it follows that, given the area of a plane horizontally cutting the cold gas phase as 0.16 m2, the rate of water atomised as 0.2 l/mi n (12 l/h), and the particle size of water atomised as 300 microns or less.
  • the refrigerant gas is required to be generated at 40 Nm3/h or more for an average cold gas phase temperature of -80°C or lower. The distance of the fall that the atomised particles require for freezing into microfine frozen particles is approximately one metre.
  • Ice particles 14b on the screen 5 move along the downward slope of the screen aided by the action of the cold vapour component in the form of refrigerant gas 12a passing upward through the screen 5. They are eventually collected through the collecting pipe 6.
  • the iced particles collected are drawn out of the apparatus 1 by the action of the collecting valve 6a and can be used for blasting etc.
  • the formation of frozen particles from atomised water is influenced by the quantity of the water atomised, the temperature of the cold gas phase, the rate of the generation of the refrigerant gas, the particle size, the speed of the fall of the frozen particles, and the time of the contact between the frozen particles and the cold gas. Experiments and tests will easily provide the appropriate values of these factors to technicians who need them.
  • the collection of iced particles 14b in the collecting pipe 6 is influenced by the angle theta formed by the screen 5 with a horizontal plane, the temperature of the upper side of the screen 5, the rate at which the refrigerant gas 12a passes through the screen 5, and the particle size of the iced particles 14b, the collection can be further improved, irrespective of said various influencing factors, by giving the screen vibrating or shaking motion continuously or intermittently by means of a device such as vibrator.
  • FIG. 2 there is shown schematically an exhaust heat recovery chamber 16 placed adjoining to and at an upper part of the freezing vessel 1 with a cold gas exhaust outlet 1a opened between said chamber and vessel.
  • the exhaust heat recovery chamber 16 is provided with a frozen particle ejector 15 at the bottom.
  • a frozen particle-collecting pipe 6 and a drive gas conduit 17 are connected to the frozen particle ejector 15, so that when a drive gas is drawn into the ejector 15 through the conduit 17, the drive gas exercises an ejecting effect so that the frozen particles 14b are drawn to the ejector 15 through the collecting pipe 6 and therefrom ejected onto an object for surface treatment 18.
  • the part 19 of said drive gas conduit 17, placed in the exhaust heat recovery chamber 16, is designed to function as a heat exchanger, which cools the drive gas by its heat exchange with the refrigerant gas 12a which is brought through the cold gas exhaust outlet 1a into th e exhaust heat recovery chamber 16.
  • the part 19 of the drive gas conduit, which functions as a heat exchanger is made of a thick pipe material with many circumferential fins 19a (see Figure 3) and made in the form of a coil so as to optimise the area of heat transfer with the refrigerant gas 12a as well as to impart a heat accumulation effect thereto.
  • a copper alloy or the like having a high thermal conductivity is suitable as the material of the part 19 of the drive gas conduit.
  • the drive gas can be cooled sufficiently without using a particular cooling means and such problems as lowered hardness and agglomeration of frozen particles 14b can be further reduced.
  • the refrigerant gas 12a is not generated in an intermittent operating schedule, the heat accumulating effect keeps the drive gas cool.
  • the drive gas can thus be cooled to a temperature close to that of the refrigerant gas 12a exhausted from the freezing vessel 1, but when it is required to cool the drive gas further, it is practical to atomise a refrigerant such as liquid nitrogen toward the drive gas conduit 19 from a refrigerant atomising nozzle 20 at the top of the exhaust heat recovery chamber 16.
  • the screen 5 unlike the inclined screens as shown in Figures 1, 2 and 4, can be set horizontally as shown in Figure 5 so that the frozen particles 14a piling up on the screen 5 can be removed therefrom by a scraper 22, moved back and forth by a cylinder 21 or the like, and collected in a hopper 23a of a frozen particle recovery chamber 23.
  • the frozen particles 14b collected in the hopper 23a are drawn through a frozen particle-supplying pipe 24 into an ejector 15 under the force of the drive gas supplied through a conduit 17 and ejected onto an object under treatment 18.
  • the means for collecting frozen particles 2 can be so designed that the screen 5 inside the freezing vessel can be brought out of the freezing vessel for collection.
  • one such means consists of, as shown in Figure 6, an endless mesh belt 5 ⁇ as the screen 5. While functioning as a conveyor belt 25, the conveyor divides the inside of the freezing vessel into the upper section 7a and the lower section 7b. One turning end of the conveyor belt is brought into the frozen particle recovery chamber 23 so that the frozen particles 14b piling on the mesh belt 5 ⁇ come to the turning end of the conveyor belt in the frozen particle recovery chamber 23 and are collected into a hopper 23a therein.
  • the screen can be a horizontally rotating plane 5 ⁇ driven by a drive mechanism 26 so that, when the frozen particles 14b piling thereon are brought in position for collection inside the frozen particles recovery chamber 23, they are collected into the hopper 23a by means of a scraper 27.
  • the atomised particles to be frozen 14a are made to freeze by heat exchange with only a cold vapour component such as a vaporized refrigerant 12a in the cold vapour region with the present invention, they are free from the striking action of the liquid refrigerant which would cause irregularity in globular shape of the frozen particles and inappropriate dispersion as conventionally.
  • the method and apparatus provided by the present invention optimise obtaining microfine frozen particles 14b with uniform particle sizes and globular shapes optimal for abrasives in blasting, cleaning, etc.
  • the frozen particles 14b lying on the screen 5, 5 ⁇ , or 5 ⁇ are kept frozen and in motion by virtue of a refrigerant gas 12a so that the production of frozen particles can be carried out with ease and satisfactorily, without involving the problems of lowered hardness or agglomeration between particles.
  • a cooling gas supplying system wherein a cooled gas-supplying pipe 28 is drawn from a cooling gas source 29 and connected to the lower region 7b of a freezing vessel 1 (a heat-insulated closed vessel with a circular horizontally cutaway section, measuring 400 mm in inner diameter and approximately 1,500 mm in height).
  • the cooled gas-supplying pipe 28 is equipped with a compressor 30, moisture remover 31, heat exchanger 32, and filter 33, which all are arranged in a direct single line in this order from the cooling gas source 29.
  • a compressor 30 having a capacity of 92 Nm3/h, which can pressurize the cooling gas up to 5 Kg/cm, was used.
  • a dehumidifier of the pressure variable type based on synthetic zeolite as adsorbent, was used.
  • the heat exchanger 32 used was of the fin-aided type (refrigerant vaporizing temperature -80°C, heat exchanging capacity 2,500 Kcal/h), which was designed to cool the cooling gas by heat exchange with a refrigerant (R-12) which circulated between the heat exchanger 32 and a refrigerator 34.
  • the refrigerator 34 used had a refrigeration capacity of 2,500 Kcal/h and a shaft power of 5 KWh.
  • a membrane filter (screening ability 0.1 micron) was used.
  • a similar filter 10a was used in the atomisation gas conduit 10.
  • air 20°C as a cooling gas is passed through a compressor 30, moisture remover 31, heat exchanger 32, and filter 33 and supplied from the supplying pipe 28 into the region of cold vapour 7b in the freezing vessel 1.
  • the air taken in from the cooling gas source 29 is pressurized up to 5 Kg/cm2 by a compressor 30, cooled to -80°C in the heat exchanger 32 by heat exchange with the refrigerant from the refrigerator 34, then purified by the filter 33 and drawn into the lower region 7b of the freezing vessel 1.
  • the cooled air is supplied at the flow rate of 80 Nm3/h.
  • the cooling gas supplying system dispenses with the compressor 30 and the moisture remover 31.
  • the dry air obtainable therefrom can be utilized for the cooling gas, for example, as shown in figure 9A, by connecting a dry air line 36 with the cooling gas-supplying pipe 28. Water to be frozen is atomised from the atomiser 8 when the cooled air sent into the cold vapour source region 7b has passed through the screen 5 and fills the region of cold vapour 7a.
  • water is supplied to the atomiser 8 at the rate of 10 l/h together with the supply of nitrogen gas for atomisation at the rate of 1 Nl/h so that the water is atomised downward into said cold gas in the freezing vessel with the force of 2.6 Kg/cm2.
  • the gas conduit 10 is connected in a manner of branching with the cooling gas-supplying pipe 28 so as to supply part of the cooling gas (e.g., dry air obtainable after the dehumidification) to the atomiser.
  • the cooling gas e.g., dry air obtainable after the dehumidification
  • the cooled air gradually rises toward the cold gas exhaust outlet 1a as it undergoes change in densities as the result of heat exchange with the wat er droplets formed by atomisation.
  • the water droplets formed by the atomisation fall naturally through the cold gas in the upper region 7a and freeze as they fall by heat exchange with the rising cooled air, and the iced (frozen) particles caught on the screen 5 are collected through a frozen particles-collecting outlet 6.
  • iced particles having a temperature of -70°C and particle sizes in the range 100-200 microns were produced at the rate of 10 Kg/h.
  • the cooled gas-supplying means 4 ⁇ shown in Figure 10, is equipped with a compressor 30, heat exchanger 32, and refrigerator 34, each of which is lower in capacity than those referred to above, and moreover, with an ejector 37 by which a mixture of cooled gas and liquid nitrogen as a refrigerant is ejected.
  • the ejector 37 having its nozzle opened toward the region 7b in the freezing vessel 1, is connected with a cooled gas-supplying pipe 28 and a refrigerant supplying pipe 38 so that cooled gas and refrigerant are mixed at a position close to the nozzle and the refrigerant is ejected into mist into the region 7b under the ejecting pressure of the cooled gas.
  • the compressor 30 has a capacity of 35 Nm3/h for a pressure of 5 Kg/cm2, the heat exchanger 32 a capacity of 800 Kcal/h for a refrigerant vaporizing temperature of -85°C with fins, and the refrigerator 34 a capacity of 800 Kcal/h and a shaft power of 1.6 KWh.
  • Air is used as cooling gas
  • liquid nitrogen is used as refrigerant.
  • air (20°C) for cooling is pressurized up to 5 Kg/cm2 with a compressor 30, cooled to -80 C by means of the heat exchanger 32 and the refrigerator 34, and the cooled air is purified by the filter 33, and then supplied to the ejector 37, while liquid nitrogen (-196°C) drawn in a refrigerant-supplying pipe 38 is supplied to the ejector 37 at the rate of 10 Nm3/h and ejected together with the cooled air into the region 7b in the form of mist.
  • the cooled air is supplied at the rate of 30 Nm3/h and the liquid nitrogen is supplied at the rate of 10 Nm3/h.
  • the compressor 30 and the moisture remover 31 are not required if the cooling gas is a gas of nitrogen, argon, or the like instead of air. If the manufacturing plant is equipped with a dry air-supplying system, the dry air can be utilized for the cooling gas and the atomising gas either in part or for all of the requirements.
  • the water to be frozen is atomised from the atomiser 8 when the mixture (-160°C) of the cooled gas and the ejected vaporized refrigerant passes through the screen 5 and the cold gas has filled the region 7a.
  • the atomising gas is supplied thereto at the rate of 1 N l/h, and the water is atomised downward into the cold gas phase with the pressure of 2.5 Kg/cm2.
  • the cooling gas-supplying pipe 28 is connected with the conduit 10 of the atomising gas in a manner of branching, as shown in Figure 10, so as to utilize dehumidified dry air which constitutes part of the cooling gas.
  • the energy consumption rate becomes 0.69 KW/Kg.ice for a cooled gas temperature of -130°C.
  • the energy consumption rate required becomes 5.25 KW/Kg.ice when a refrigerant is introduced in a system as shown in Figure 1 under the same conditions in other respects.
  • the mixed gas method is capable of producing frozen particles of a temperature in the range -50°C - -100°C as in the case of a cooled gas system.
  • the energy consumption rate required in such a system is calculated to be, provided that the cold gas phase energy required in producing 1 Kg iced particles of -130°C is approximately 140 Kcal: 1.9 KW/Kg.ice when the mixed gas obtained by mixing cooled air of -80°C (2.95 Nm3, taken in at 20°C) as cooled gas with liquid nitrogen (0.95 Nm3) as refrigerant has a temperature of -150°C.
  • a reduction to one-third in the energy consumption rate is possible when the mixed gas system is applied instead of the refrigerant gas system, the use of refrigerant increasing the energy consumption rate somewhat over that for the system of cooled gas alone.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP87304480A 1986-10-06 1987-05-20 Procédé et dispositif pour la production de particules congelées microfines Withdrawn EP0266859A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP238695/86 1986-10-06
JP23869586A JPH0781763B2 (ja) 1986-10-06 1986-10-06 凍結粒製造装置
JP61244878A JP2524714B2 (ja) 1986-10-15 1986-10-15 凍結粒の製造方法
JP244878/86 1986-10-15

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EP0266859A1 true EP0266859A1 (fr) 1988-05-11

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EP (1) EP0266859A1 (fr)

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EP0445786A1 (fr) * 1990-03-07 1991-09-11 Linde Aktiengesellschaft Procédé et dispositif pour la congélation de matière fluide
WO1991014908A1 (fr) * 1990-03-19 1991-10-03 I.Q.F. Inc. Appareil cryogenique
EP0461160A4 (en) * 1989-03-01 1992-01-15 Andrew Boyd French Snowmaking method and device
EP0509132A1 (fr) * 1991-04-19 1992-10-21 Szücs, Eva Abony Méthode et dispositif pour le nettoyage de surfaces, en particulier de surfaces délicates
US5318636A (en) * 1991-04-19 1994-06-07 Eva Abony Szucs Method for cleaning surfaces, in particular sensitive surfaces
EP0945173A1 (fr) * 1998-03-25 1999-09-29 Herbert Dressler Installation et procédé pour la préparation de matière en poudre
EP1301750A4 (fr) * 2000-07-17 2004-12-08 Dippin Dots Inc Processeur cryogenique pour la preparation liquide d'alimentation d'un produit gele fluide
WO2017085508A1 (fr) 2015-11-19 2017-05-26 Sofia University "St. Kliment Ohridski" Procédé pour la préparation de particules ayant une forme et/ou taille régulée

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Publication number Priority date Publication date Assignee Title
JPH0440141Y2 (fr) * 1987-02-09 1992-09-21
DE3844648C2 (fr) * 1987-06-23 1992-02-20 Taiyo Sanso Co. Ltd., Osaka, Jp
JPH03116832A (ja) * 1989-09-29 1991-05-17 Mitsubishi Electric Corp 固体表面の洗浄方法
JPH0435872A (ja) * 1990-05-30 1992-02-06 Mitsubishi Electric Corp 凍結粒子を使用した研磨装置
US5182944A (en) * 1991-01-18 1993-02-02 Brunnenkant Siegfried W Helicopter icing spray system
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